pCGR2 copy number depends on the par locus that forms a ParC-ParB-DNA partition complex in Corynebacterium glutamicum

Naoko Okibe, Nobuaki Suzuki, Masayuki Inui, Hideaki Yukawa

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Aims: To characterize the par system of Corynebacterium glutamicum pCGR2 and to manipulate the par components to effectively manipulate plasmid copy number. Methods and Results: ParB binds sequence specifically to centromere-binding sites around the parAB operon and serves as an autorepressor. A small ORF (orf4, later named parC) downstream of parAB encodes a protein with 23·7% sequence identity with ParB. ParB is also implicated in the repression of parC transcription. Nonetheless, this ParC protein does not bind to centromere-binding sites and is not essential for plasmid stability. Introduction of a frameshift mutation within ParC implicated the protein in regulation of both parAB and parC. Electrophoretic Mobility Shift Assay confirmed a previously unreported ParC-ParB-parS partition complex. ParC also interacts directly with ParB without the mediation of the centromere sites. Deletion of the par components resulted in different plasmid copy numbers. Conclusions: A previously unreported ParC-ParB-parS partition complex is formed in pCGR2, where interaction of ParC with ParB-parS may affect the level of repression by ParB. Modifying the par components and antisense RNA enables manipulation of plasmid copy number to varying degrees. Significance and Impact of Study: Genetically manipulating the par components, in combination with deactivation of antisense RNA, is a novel approach to artificially elevate plasmid copy number. This approach can be applied for development of new genetic engineering tools.

Original languageEnglish
Pages (from-to)495-508
Number of pages14
JournalJournal of Applied Microbiology
Volume115
Issue number2
DOIs
Publication statusPublished - Aug 1 2013

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Corynebacterium glutamicum
Plasmids
Centromere
DNA Topoisomerase IV
DNA
Antisense RNA
Binding Sites
Frameshift Mutation
Genetic Engineering
Electrophoretic Mobility Shift Assay
Operon
Open Reading Frames
Proteins

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Applied Microbiology and Biotechnology

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pCGR2 copy number depends on the par locus that forms a ParC-ParB-DNA partition complex in Corynebacterium glutamicum. / Okibe, Naoko; Suzuki, Nobuaki; Inui, Masayuki; Yukawa, Hideaki.

In: Journal of Applied Microbiology, Vol. 115, No. 2, 01.08.2013, p. 495-508.

Research output: Contribution to journalArticle

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